Drill chord progressions: playable dark loops and why they work

Drill chord progressions are short, minor-key loops built on tension: usually two chords, sometimes three, and often just one droning root note dressed with dissonant color tones. The signature moves are small, a flat six rubbing against the fifth, a Phrygian flat two, a half-step piano riff, and each one maps to a specific shade of the genre’s darkness. Every example below is playable, written with a bell lead and a dark filtered pad so you hear the harmony alone, without drums or bass. They’re all in A minor, but the same principles transfer to any key.

Drill, at its core, is tension and contrast wrapped in a feeling of darkness and danger. The chords are where that feeling starts.

What makes a chord progression sound like drill?

A drill progression sounds like drill because of its intervals, not its notes. A single note carries no feeling on its own; the emotion lives in the distances between notes and in how those distances change. That’s why the genre’s harmony can be so minimal: two chords, or one chord and one altered copy of it, are enough when the intervals are chosen for menace.

The other half of the recipe is an anchor. Drill harmony is grounded by a stable, sustained layer playing the root and the fifth (A and E in these examples), so the faster-moving tension notes have a fixed point to grind against. Without the anchor, dissonant notes just sound wrong; against it, they sound dangerous. Keep that in mind through every example below: the pad is doing quiet, essential work.

Drill shares its harmonic world with the wider dark trap palette, but it pushes further into dissonance than most of its neighbors.

What are the classic two-chord drill progressions?

The classic drill progression loops the minor one chord against a darker version of itself. Four variations cover most of the genre, each with its own emotional temperature.

Am to Am(add♭6), the fundamental building block. The flat six (F) enters over the plain minor chord and rubs a half step against the fifth. This is the core drill movement, and everything else on this page is a variation of its logic.

Am to Am(add9, ♭6, no3). Dropping the third and stacking the ninth against the flat six gives the change more harmonic movement and more dissonance. The result is unease: the loop never settles, and the listener feels it without knowing why.

Am to Am(add9, no3). Take the flat six away and the harmony turns static and far less dissonant. Nothing is going anywhere, and that’s the point: this is the sound of lurking in the dark without being noticed. No action yet, just observation.

Am to B♭(add9, no3). Moving the whole chord up a half step borrows from the Phrygian mode, and the sound turns evil. Where the flat six merely unsettles, the flat two threatens: this is aggression and immediate danger, the heat of the moment rather than the buildup to it.

What happens when the chords overlap?

Long-tailed sounds, a ringing bell or a reverb-heavy piano, let one chord bleed into the next, and the fewer notes the chords share, the more dissonant the blend. This pair shares only the C, so the overlap stacks A against B♭ and E against F, two minor seconds at once. Below, each chord gets half a bar on a bell; the tails do the blending.

That clashing wash is a horror-film staple, and exactly the territory horror rap builds beats from. In drill, use it sparingly; it’s the darkest color on the palette.

Which drill progressions release the tension?

Not every drill loop maximizes dissonance; some trade menace for mood, and those are the ones that give a project contrast. Two neighbors of the one chord do most of this work.

Am to Dm. A simple move with no obvious tension. The feeling is a mix of chill and a quiet undercurrent of sadness, drill in its reflective register.

Am to F. The same idea but more resolved. The tension drops further, and the loop turns straightforward and energetic; less desperation and unease, more of a “let’s go” feel.

How do three-chord drill progressions work?

Three-chord drill progressions add a story arc that two chords can’t tell, usually with uneven durations so the loop breathes. Two shapes cover the territory.

Am, F, Dm. The bass walks downward (A to F to D), often with durations of 4, 4 and 8 beats so the last chord gets room to sit. There’s little tension in the changes themselves; instead the arc lands on a chord that injects sadness and grief, which in drill’s context often reads as anger and revenge.

Am, F, G. By drill standards this is an uplifting, energetic progression with a forward-leaning feel. Give the G the shortest slot at the end of the loop and it becomes a stepping stone, resolving the cycle back into Am. The loop feels like motion, a car ride at night.

What if there’s no chord progression at all?

Plenty of drill has no progression worth analyzing, and hearing one where none exists is a common trap. Think of those tracks as a droning root note instead, sometimes with the fifth, with the mood set entirely by which notes the melody picks around it. The drone plays the anchor role from earlier; the melody notes decide the emotional color.

Three palettes cover the classic choices over an A drone. Each player holds the root and fifth in the pad while the bell walks the palette.

Phrygian: G, A, B♭. Dark, mysterious and ritualistic, with that flat two signaling immediate danger.

Aeolian: E, F, G. The classic dark drill sound, melancholic and emotional rather than threatening.

Harmonic minor: G♯, A, C. Dramatic, cinematic and a little exotic, the sound of impending doom.

Listen to what the bell’s long tail does in these players: each note rings well past its written length, so neighboring tones from the palette (the B♭ against the A, the F against the E) briefly sound together and the dissonance compounds. Long-decaying bells and reverby pianos create this overlap on their own, which is one reason drill melodies feel more dissonant than their note count suggests. Pick the sound with the tail in mind; it’s part of the harmony.

Why is the F note so important in A-minor drill?

The flat six is the single most load-bearing note in drill harmony, and in A minor that’s F. You’ve already heard it three ways: as the add♭6 in the fundamental progression, inside the unease of the add9 voicing, and in the Aeolian melody palette. Its most iconic delivery, though, is a lone half-tempo piano riff circling four notes: B, C, E and F. Those two half-step pairs (B against C, E against F) create the signature dissonance and tension running through almost every drill melody.

Notice again what the anchor is doing: the riff only sounds tense because the sustained A and E hold still underneath it. Move the anchor and the same four notes lose their meaning.

Do the bass and vocals change the mood?

Yes, and it’s worth planning for, because the harmony only sets the first layer of feeling. Two other layers stack their own emotion on top.

The bass doesn’t have to agree with the chords. In A minor the bass can freely visit G, underlining the minor feel, and F♯ is a common choice precisely because it adds tension of its own. The melody doesn’t have to be the only source of friction. Drill basslines are their own craft; how to make drill 808 slides covers the gliding low end these progressions sit on.

Vocals are two-sided. The lyrics carry one feeling and the performance carries another, and a deliberate mismatch between them is one more form of drill tension: humorous lyrics delivered with aggression turn sarcastic, and a laconic, flat delivery over violent content lands colder than shouting ever would. Combined with drums that set their own energy, this means the same progression can support very different songs. Pick the harmony for the shade of darkness you want, and let the other layers argue with it.

How do you start writing drill harmony?

Start with the anchor and one two-chord loop, and resist adding more. Sustain the root and fifth, loop Am against the add♭6 version, and put the four-note piano riff on top; that skeleton is a legitimate drill beat waiting for drums. The broader theory behind these moves, scale degrees and why minor loops work, is in the trap chord progressions guide, and the drill style page covers the genre beyond the harmony.

Songen knows drill as one of its 50+ styles and generates the whole loop (lead, chords, bass and drums) as editable MIDI, so you can hear these ideas in a full beat within seconds. Its chord progression builder recommends the next chord as you build, and generates a drill loop from the exact progression you choose; try feeding it the Am to F to Dm arc from this page. Then regenerate the lead until the melody finds the flat six on its own, or open the piano roll on the Mac app and put it there yourself.